Configuring Pulse Inputs - Emerson Micro Motion 3711 Configuration And Use Manual

Configuring I/O
In operation, the discrete output's On period will be calculated from the values configured for discrete
output scaling plus the configured EU Value. The formulas used for calculation are as follows:
=
EUSpan HighReadingEU
=
CountSpan
ConfiguredEUValue
= ---------------------------------------------------------------------------- -
OnPeriod
For a flow rate of 100 MCF, the discrete output's cycle has the following form:
• ON for 4 seconds
• OFF a minimum of 8 seconds
For a flow rate of 650 MCF, the discrete output's cycle has the following form:
• ON for 9 seconds
• OFF a minimum of 3 seconds
If the calculated On period is equal to or greater than the cycle time, the Off period is set to one
second. Be sure to set the TDO parameters so that cycle time is always greater than the calculated On
period.
7.9

Configuring pulse inputs

You need to configure pulse inputs if the Model 3711 was purchased with the I/O option, and you
configured the I/O terminals for one or two pulse inputs. You may need to configure one or two pulse
inputs.
To configure a pulse input:
1. Click
Configuration > I/O > PI Points
displayed. See Figure 7-13.
Figure 7-13 Pulse Input – General panel
Configuration and Use Manual
– LowReadingEU
–
100%Count 0%Count
×
CountSpan
EUSpan
+
0%Count
. The Pulse Input dialog box, containing three panels, is
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